#include<stdio.h>
int a,b;
void getsum(void)
{

}
int getsum2(int a,int b)
{
    return a-b;
}
int main()
{
    getsum();
    int s1,s2,s3;
      printf("请输入两个相减数字: ");
      scanf("%d%d",&s1,&s2);
      s3=getsum2(s1,s2);
      printf("%d-%d=%d\n",s1,s2,s3);
      
      return 0; 
}
